drm/i915/dp: Add support for "4:2:0 also" modes for DP
Currently we only support "4:2:0 also" modes on native HDMI. Extend that support for DP as well. With all the HDMI DFP TMDS clock handling sorted out this is now going to work for both native DP and DP->HDMI converters. As with native HDMI we first check if RGB output is possible, and if not we try YCbCr 4:2:0 instead. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220322120015.28074-10-ville.syrjala@linux.intel.com Reviewed-by: Uma Shankar <uma.shankar@intel.com>
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